
//执行上下文
class ExecutionContext{
    constructor(lexicalEnvironment,thisBinding){
        //全局词法环境 变量环境 = 词法环境
        //variableEnvironment创建后就不会变了，lexicalEnvironment词法环境会随着函数的过程会改变
        this.variableEnvironment = this.lexicalEnvironment = lexicalEnvironment;
        //this指针
        this.thisBinding = thisBinding
    }
}
module.exports = ExecutionContext